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Chris Huff wrote:
>
> But what would the resulting vector be? Would it be a rgb vector, or a
> hsl, etc...
> #declare Color = color red 0.6 hue 0.75;
> Is Color.x red or hue? Is Color.y green or saturation?
Whatever you do, you'll need a unique internal representation (which
should probably be rgb to avoid breaking something elsewhere in the
code). If Color.(x/y/z) is to make any sense, it would be with relation
to this internal representation. I personnally would favor using
Color.red or Color.hue...
> I think this would be better done with color conversion functions, not
> the color specification. The idea is that you pick a color space and
> then set each component, when you try to set a component that isn't part
> of the color space things get messy. To get the grayscale of a color, it
> would be something like:
> #declare Color = color rgb rgb_to_hsl(<whatever>).z;
>
This makes for more things to type and isn't any clearer or easy to
understand. Moreover, if you need to remember in wich space you defined
each color, you're in for a lot of bugs in your scenes ("Why the h*** is
that sphere white instead of blue???")
> It could be done so you don't have to specify the pattern twice, and it
> would give much more flexibility. And I never have understood why
> transparency was considered part of the color...the only explanation I
> can think of is that it developed from the use of alpha channels in
> images. It seems more of an interior feature to me, or a separate
> texture attribute.
> And they usually follow the same pattern because it would be very
> difficult (impossible?) to get them to do otherwise with the current
> syntax. If it was easily possible to do it differently that might not be
> the case.
>
Maybe, but OTOH you don't need to specify a color where the object is
fully transparent, so their patterns are related. I've never felt the
need to specify transparency independently from color...
--
* Abandon the search for truth, * mailto:ber### [at] iname com
* Settle for a good fantasy. * http://www.enst.fr/~jberger
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